MAGIC RETOUCH brush covers gray hair from L'Oréal Paris . Brush covers localized gray hair from L'Oréal. This product is the solution to touch up those unwanted gray hairs in temples and other localized areas. Its application is very easy thanks to its precise brush with which you can apply the product and distribute it evenly. Once applied, you only have to wait 5 minutes to let it dry to show off gray hair.